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Highly efficient and green micro/nano cellulose preparation with micro-nano bubbles from mild alkali pretreated bagasse

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Abstract

Cellulose extraction accounts for 70% of the total production cost required for the preparation of micro/nano cellulose. Conventional pretreatment methods cause equipment corrosion and generate non-recyclable waste liquids. Thus the industrial-scale preparation of micro/nano cellulose is limited. To overcome this limitation, herein, a method is proposed, where in a mild alkaline pretreatment is combined with the micro-nano bubble (MNB) treatment, for the extraction of cellulose from bagasse. A delignification rate of > 92% was attained, micro/nano cellulose was exposed on the pulp surface owing to the MNB treatment; the 4-h MNB treatment resulted in the complete exposure of micro/nano fibers. The production cost for this process was only 3.19 USD/kg of CNFs, about 70.9 times lower than that of TEMPO oxidation. An appropriate MNB treatment time (1 h, 2 h) allowed the retention of moderate micro-fibers, which enhanced the maximum tensile force and tensile strength of micro/nano cellulose paper by about 50%. The results revealed that the proposed method serves as an efficient, green, and sustainable strategy for the large-scale and low-cost production of micro/nano cellulose.

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Acknowledgments

This study was financially supported by National Natural Science Foundation of China (Nos. 21908127, 91934302, 21978128) and the fund of the State Key Laboratory of Materials-Oriented Chemical Engineering (ZK202006), the Project Supported by the Foundation (GZKF202103) of State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology Shandong Academy of Sciences.

Funding

This work was supported by National Natural Science Foundation of China (Nos. 21908127, 91934302, 21978128) and the fund of the State Key Laboratory of Materials-Oriented Chemical Engineering (ZK202006), the Project Supported by the Foundation (GZKF202103) of State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology Shandong Academy of Sciences.

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YQ, TP, and HH, performed the experiments, collected and analyzed the data. ML, HX, XF, and XL, helped with data analysis and discussions. LZ, and JZ conceived the experiments, planned synthesis, analyzed results, and wrote the paper. All authors reviewed the manuscript.

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Correspondence to Lilong Zhang or Jiahua Zhu.

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The authors have no relevant financial or non-financial interests to disclose.

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Qian, Y., Ping, T., Huang, H. et al. Highly efficient and green micro/nano cellulose preparation with micro-nano bubbles from mild alkali pretreated bagasse. Cellulose 30, 9379–9390 (2023). https://doi.org/10.1007/s10570-023-05457-5

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  • DOI: https://doi.org/10.1007/s10570-023-05457-5

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